US7200115B2 - Method of managing non-acknowledgement responses - Google Patents

Method of managing non-acknowledgement responses Download PDF

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Publication number
US7200115B2
US7200115B2 US10/147,473 US14747302A US7200115B2 US 7200115 B2 US7200115 B2 US 7200115B2 US 14747302 A US14747302 A US 14747302A US 7200115 B2 US7200115 B2 US 7200115B2
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channel
receiver
identifier
status identifier
data packet
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US20030214935A1 (en
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Farooq Ullah Khan
Douglas N. Knisely
Safwan Zaheer
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Nokia of America Corp
WSOU Investments LLC
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Lucent Technologies Inc
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Priority to EP03252702.0A priority patent/EP1363422B1/en
Priority to KR1020030029561A priority patent/KR100971892B1/ko
Priority to JP2003138259A priority patent/JP4410487B2/ja
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1628—List acknowledgements, i.e. the acknowledgement message consisting of a list of identifiers, e.g. of sequence numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements

Definitions

  • the present invention relates to wireless communication, and more particularly, a method of managing non-acknowledgement (NAK) responses sent by a receiver in a wireless communication system.
  • NAK non-acknowledgement
  • an air interface is used for the exchange of information between a mobile station and a base station or other communication system equipment.
  • the air interface typically comprises a plurality of communication channels.
  • a channel is time varying due to fading, mobility, and so on. More specifically, channel quality may be affected by factors such as distance between the mobile and base station, speed of the mobile station, interference, and the like. Given the limited resources (e.g., bandwidth) of wireless transmission as well as the large number of mobile stations supported by a base station at any given time, and therefore competing for those limited resources, it is important to maximize throughput of a wireless communication system.
  • FIG. 1 illustrates a portion of the layered structure for a transmitter 10 (e.g., such as in a base station) and a receiver 20 (e.g., such as in a mobile station) in a wireless communication system as set forth in third generation wireless standards such as CDMA-2000 employing H-ARQ.
  • the H-ARQ may be called Asynchronous and Adaptive Incremental Redundancy (AAIR).
  • RLP Radio Link Protocol
  • MAC medium access control
  • the data packets include a sequence number identifying their order in a sequence of transmitted data packets.
  • the physical layer 16 turbo encodes the data packet and transmits a portion of the encoded data packet—this portion being referred to as a sub-packet—over a H-ARQ channel assigned for communication between the transmitter 10 and the receiver 20 .
  • the physical layer 26 of the receiver 20 receives the sub-packet and attempts to decode the sub-packet to obtain the entire data packet. If successful, the data packet is sent to the RLP 22 in the MAC 24 of the receiver 20 .
  • the physical layer 26 also sends an acknowledgement response (ACK) to the transmitter 10 for a properly received data packet. If the physical layer 26 is unable to decode the sub-packet, then the physical layer 26 sends a non-acknowledgement (NAK) response to the transmitter 10 .
  • ACK acknowledgement response
  • the physical layer 16 of the transmitter 10 expects to receive an ACK or NAK response two time slots after sending the sub-packet.
  • a time slot is 1.25 ms.
  • the physical layer 16 encodes and transmits another data packet to any scheduled user in the system.
  • no response or a NAK response is received from the physical layer 26 , the physical layer 16 transmits the next sub-packet to the same user.
  • Standards such as CDMA-2000 establish a maximum number of sub-packet transmissions for each packet. When the maximum number of sub-packet transmissions is reached, the physical layer 16 flushes the data packet in its buffer. The physical layer 16 then encodes and transmits another data packet for a user, which is scheduled by the transmitter 10 .
  • the RLP 22 of the receiver 20 receives data packets having sequence numbers 1 and 3 , respectively, before receiving the data packet of sequence number 2 .
  • the three data packets may be sent over three different H-ARQ channels to the receiver 20 and it may take more sub-packet transmissions for proper receipt of data packet 2 as compared to that of data packets 1 and 3 .
  • the RLP 22 judges the data packet of sequence number 2 as missing and issues a NAK response, which is sent to and received by the RLP 12 of the transmitter 10 .
  • the RLP 12 reschedules transmission of the data packet having sequence number 2 .
  • the data packet having sequence number 2 may eventually be properly received as a result of later sub-packet transmissions; thus, rendering the rescheduling moot. Even if this occurs, the rescheduling continues, and resources and capacity are wasted.
  • a status identifier is sent to the receiver for a channel assigned to the receiver.
  • the status identifier for the channel indicates whether a maximum number of sub-packet transmissions for a data packet have taken place.
  • the receiver sends a NAK response if it has not yet received the data packet.
  • a number of sub-packet transmissions for a data packet being sent over a channel to the receiver are counted, and a channel identifier, identifying the channel to the receiver, is sent to the receiver if the count number reaches a maximum number of permitted sub-packet transmissions.
  • the receiver sends a NAK response for the channel.
  • a service identifier is sent instead of the channel identifier.
  • each channel carries a data packet associated with a different service such that identification of the service means identification of the channel.
  • a status identifier and a service identifier are sent to the receiver for a channel assigned to the receiver.
  • the service identifier identifies a type of service (e.g., Voice over IP, e-mail, etc.) associated with a data packet being sent over the channel and the status identifier indicates whether a maximum number of sub-packet transmissions for the data packet have taken place.
  • the receiver sends a NAK response if the status identifier indicates that the maximum number of sub-packet transmissions for the data packet have taken place and the data packet has not been properly received.
  • the receiver identifies the channel associated with the status identifier based on at least one of the service identifier and a position of the status identifier in a sequence of received information.
  • the channel is at least one of a Hybrid-Automated Repeat request (H-ARQ) and an Automated Repeat reQuest channel.
  • H-ARQ Hybrid-Automated Repeat request
  • Automated Repeat reQuest channel an Automated Repeat reQuest channel.
  • FIG. 1 illustrates a portion of the layered structure for a transmitter and a receiver in a wireless communication system as set forth in third generation wireless standards employing H-ARQ;
  • FIG. 2 illustrates the format of a bit sequence transmitted over a control channel according to one embodiment of the present invention.
  • H-ARQ Hybrid Automated Repeat reQuest
  • sub-packets of a data packet are sent over the H-ARQ channel by the physical layer 16 .
  • the physical layer 16 also generates a status bit for each H-ARQ channel, and sends the status bits over a control channel to the receiver 20 .
  • the status bit indicates whether a maximum number of sub-packet transmissions for a data packet being sent over the H-ARQ channel have taken place.
  • a logical ‘1’ status bit represents a pending sub-packet transmission, and a logical ‘0’ status bit represents no more sub-packet transmission will take place (i.e., the maximum number of sub-packet transmissions have taken place).
  • the status bits of the n H-ARQ channels of the receiver 20 are sent by the physical layer 16 as a sequence over a control channel directed to the receiver 20 or a common control channel. So that the physical layer 26 of the receiver 20 can identify that the status bit sequence is intended for the receiver 20 when the status bit sequence is sent over a common control channel, the physical layer 16 sends an identifier of the receiver 20 , for example, the MAC ID of the receiver 20 , along with the status bit sequence.
  • the physical layer 26 indicates the status of the H-ARQ channels to the RLP 22 of the receiver 20 .
  • the RLP 22 uses the status in determining whether to send a NAK response for a H-ARQ channel to the transmitter 10 . Specifically, the RLP 22 will not send a NAK response for a H-ARQ channel unless the data packet being transmitted on a H-ARQ channel has not been properly received and the status of the H-ARQ channel indicates that the maximum number of sub-packet transmission have taken place (e.g. a logical ‘0’ status bit indicating no more sub-packet transmission will take place).
  • this embodiment of the present invention improves capacity by preventing needless re-scheduling and transmission of data packets.
  • the RLP 22 of the receiver 20 receives data packets having sequence numbers 1 and 3 , respectively, before receiving the data packet of sequence number 2 , the RLP 22 will not automatically issue a NAK response for the data packet having a sequence number of 2 . Instead, if the status bit for the H-ARQ channel carrying the data packet having a sequence number of 2 indicates that sub-packet transmissions are pending, the RLP 22 will not send a NAK response. If the data packet having a sequence number of 2 is successfully received before receipt of a logic ‘0’ status bit, this methodology will prevent needless re-scheduling and transmission of the data packet having a sequence number of 2 .
  • the physical layer 16 assigns a counter to each H-ARQ channel. Each counter counts the number of sub-packet transmissions for a data packet on the assigned H-ARQ channel.
  • a counter for a H-ARQ channel is initially set to zero, and is incremented after each successive sub-packet transmission. Once the counter reaches the maximum number of permitted sub-packet transmissions, the physical layer 16 sends a H-ARQ channel identifier (e.g., the ARQ Channel ID in CDMA-2000) for the H-ARQ channel associated with that counter to the receiver 20 over a control channel directed to the receiver 20 or a common control channel.
  • a H-ARQ channel identifier e.g., the ARQ Channel ID in CDMA-2000
  • the physical layer 26 of the receiver 20 can identify that the H-ARQ channel identifier is intended for the receiver 20 when the H-ARQ channel identifier is sent over a common control channel
  • the physical layer 16 sends an identifier of the receiver 20 , for example, the MAC ID of the receiver 20 , along with the H-ARQ channel identifier.
  • the counter for a H-ARQ channel is reset to zero when the maximum permitted sub-packets are transmitted or when a new data packet is to be transmitted over the H-ARQ channel.
  • the physical layer 26 indicates the H-ARQ channel identifier to the RLP 22 of the receiver 20 .
  • the RLP 22 uses the H-ARQ channel identifier in determining whether to send a NAK response for the identified H-ARQ channel to the transmitter 10 . Specifically, the RLP 22 will not send a NAK response for a H-ARQ channel unless the data packet being transmitted on a H-ARQ channel has not been properly received and the H-ARQ channel has been identified.
  • this embodiment of the present invention improves capacity by preventing needless re-scheduling and transmission of data packets.
  • the RLP 22 of the receiver 20 receives data packets having sequence numbers 1 and 3 , respectively, before receiving the data packet of sequence number 2 , the RLP 22 will not automatically issue a NAK response for the data packet having a sequence number of 2 . Instead, the RLP 22 does not send a NAK response until it receives the H-ARQ channel identifier for the H-ARQ channel carrying the data packet having the sequence number 2 . If the data packet having a sequence number of 2 is successfully received before receipt of the H-ARQ channel identifier, this methodology will prevent needless re-scheduling and transmission of the data packet having a sequence number of 2 .
  • the service identifier (e.g., the SR-ID in CDMA-2000) is sent. Because that service identified by the service identifier is only using one of the H-ARQ channels, the receiver 20 knows the H-ARQ channel from the service identifier.
  • the RLP 22 will not send a NAK response for a H-ARQ channel unless the data packet being transmitted on a H-ARQ channel has not been properly received and the service identifier for the service being received over that H-ARQ channel has been identified.
  • the physical layer 16 generates a status bit for each H-ARQ channel, and sends a bit sequence having a format as shown in FIG. 2 over a control channel to the receiver 20 .
  • the bit sequence include a status bit for the first H-ARQ channel, a service identifier (e.g., the SR-ID in CDMA-2000) for the first H-ARQ channel, . . . , the status bit for the nth H-ARQ channel, and the service identifier for the nth H-ARQ channel over a control channel to the receiver 20 .
  • the status bit indicates whether a maximum number of sub-packet transmissions for a data packet being sent over the H-ARQ channel have taken place.
  • a logical ‘1’ status bit represents a pending sub-packet transmission, and a logical ‘0’ status bit represents no more sub-packet transmission will take place (i.e., the maximum number of sub-packet transmissions have taken place).
  • the service identifier identifies the type of service associated with the data packet being sent over the H-ARQ channel. Types of services include, but are not limited to, Voice over IP, e-mail, SMS, etc.
  • the bit sequence of FIG. 2 is sent over a control channel directed to the receiver 20 or a common control channel. So that the physical layer 26 of the receiver 20 can identify that the bit sequence is intended for the receiver 20 when the bit sequence is sent over a common control channel, the physical layer 16 sends an identifier of the receiver 20 , for example, the MAC ID of the receiver 20 , along with the bit sequence.
  • the physical layer 26 indicates the status of each of the services on the H-ARQ channels to the RLP 22 of the receiver 20 .
  • the receiver 20 identifies the H-ARQ channel to which a status bit in the bit sequence corresponds based on the service identifier paired with the status bit. Namely, if the service identifier indicates the service is e-mail, and e-mail data packets are being received over the first H-ARQ channel, then the receiver 20 knows that the status bit associated with this service identifier is for the first H-ARQ channel. In another version of this embodiment, the receiver 20 identifies the H-ARQ channel to which a status bit in the bit sequence corresponds based on the position of the status bit.
  • the receiver 20 knows, a priori, that the first bit in the bit sequence is the status bit for the first H-ARQ channel, the fifth bit in the bit sequence is for the second H-ARQ channel, the ninth bit in the bit sequence is for the third H-ARQ channel, etc.
  • the RLP 22 uses the status information in determining whether to send a NAK response for a H-ARQ channel to the transmitter 10 . Specifically, the RLP 22 will not send a NAK response for a H-ARQ channel unless the data packet being transmitted on a H-ARQ channel has not been properly received and the status for the H-ARQ channel indicates that the maximum number of subpacket transmissions have taken place (i.e., a logical ‘0’ status bit representing no more sub-packet transmission will take place).
  • this embodiment of the present invention improves capacity by preventing needless re-scheduling and transmission of data packets.
  • the RLP 22 of the receiver 20 receives data packets having sequence numbers 1 and 3 , respectively, before receiving the data packet of sequence number 2 , the RLP 22 will not automatically issue a NAK response for the data packet having a sequence number of 2 . Instead, if the status bit for the H-ARQ channel carrying the data packet having a sequence number of 2 indicates that sub-packet transmissions are pending, the RLP 22 will not send a NAK response. If the data packet having a sequence number of 2 is successfully received before receipt of a logic ‘0’ status bit, this methodology will prevent needless re-scheduling and transmission of the data packet having a sequence number of 2 .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Small-Scale Networks (AREA)
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US10/147,473 US7200115B2 (en) 2002-05-17 2002-05-17 Method of managing non-acknowledgement responses
EP03252702.0A EP1363422B1 (en) 2002-05-17 2003-04-29 A method of managing negative acknowledgement responses
KR1020030029561A KR100971892B1 (ko) 2002-05-17 2003-05-10 비수신확인 응답들을 관리하는 방법
JP2003138259A JP4410487B2 (ja) 2002-05-17 2003-05-16 非受取応答を管理する方法

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EP1363422B1 (en) 2016-06-29
KR20030089442A (ko) 2003-11-21

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